Character Background

Alex Kidd is prince of planet Aries, son of King Thunder (sometimes romanized as 'Sander', in Enchanted Castle referred to as 'Thor'), and twin brother of Egle (sometimes translated as 'Igul'), the crown prince. Before the events of Alex Kidd in Miracle World, he has spent seven years living on Mount Eternal studying under his spiritual master St. Nurari, to master the Shellcore technique; an art that concentrates power in ones bare fists, making them capable of shattering rocks. On his way back home after his training had finished, he comes across a dying man who hands him a Sun Stone medallion, and tells him that King Thunder has gone missing. To make matters worse, an evil usurper named Janken the Great has kidnapped both Prince Egle and his fiancée Princess Lora, occupied the capital kingdom Radaxian, and dispatched numerous minions and henchmen around the entirety of Aries.
Through the events of Alex Kidd in Miracle World, Alex Kidd manages to rescue Egle and Lora, defeat Janken, and find the Crown that can restore peace to Aries.
His father however, remains missing. In his continued search, he gains word that King Thunder is alive and well on planet Paperock, so Alex sets out to find him in Alex Kidd and the Enchanted Castle. Traversing the dangerous lands, he gets challenged by several people for a game of Janken in order to let him on his way to the Enchanted Castle, where he eventually encounters Ashra for another Janken showdown.
After Ashra's defeat, Alex reunites with his father and Ashra is revealed to actually be King Thunder's guard and servant; the king wasn't held prisoner at all, and was merely enjoying his time on Paperock. Having cleared up this misunderstanding, Alex sends word of King Thunder's wellbeing to Aries, and from then on the inhabitants of Aries and Paperock coexist in peace.

In the Dreamcast game Segagaga, he works in a video game store. He also narrates about his competition against a certain rival company's mascot and his fall from grace due to Sonic the Hedgehog's popularity, before finally being forgotten. His appearance in the game is based on his appearance in all games in his series prior to the Enchanted Castle.

A warrior named Alex is shown in the intro sequence of the arcade version of Golden Axe, whom is quickly killed by enemy soldiers. He has no visual resemblance to Alex Kidd whatsoever, but this may have been an allusion to him.